.computer {
    width: 80%;
    height: 630px;
    margin: auto;
    border: 1px solid black;
}

.arithmetic {
    width: 100%;
    height: 50px;
    border: 1px solid black;
}

.arithmetic p {
    width: 8%;
    line-height: 50px;
}

.countname {
    width: 100%;
    height: 70px;
    border: 1px solid black;
}

.countname p {
    width: 15%;
    line-height: 70px;
}

.equation {
    position: relative;
    display: flex;
    width: 100%;
}

.execute {
    width: 100px;
    height: 50px;
    position: absolute;
    margin-left: 91.5%;
    margin-top: 170px;
}

.exportation {
    width: 100%;
    height: 200px;
    text-align: center;
    line-height: 200px;
    border-radius: 5px;
    border: 1px solid black;
}

.select {
    width: 100%;
    height: 80px;
    line-height: 80px;
    border: 1px solid black;
}

.update {
    margin-left: 750px;
}

.downlod {
    margin-left: 50px;
}